石油钻采工艺
石油鑽採工藝
석유찬채공예
OIL DRILLING & PRODUCTION TECHNOLOGY
2009年
5期
48-51
,共4页
郝希宁%汪志明%薛亮%郭晓乐
郝希寧%汪誌明%薛亮%郭曉樂
학희저%왕지명%설량%곽효악
泥浆帽钻井%漏失压力%裂缝%等效开度
泥漿帽鑽井%漏失壓力%裂縫%等效開度
니장모찬정%루실압력%렬봉%등효개도
mud cap drilling%lost circulation pressure%fracture%equivalent aperture
泥浆帽控压钻井是针对严重漏失地层的一种前沿钻井工艺,漏失压力的确定是泥浆帽钻井参数设计的关键.由于裂缝边界条件的复杂性,漏失压力预测目前还没有可靠的方法.通过对不同形式组合缝以及弯曲缝的数值模拟,分析漏失压差和裂缝参数对漏失量的影响规律.研究表明:不同形式裂缝可通过等效裂缝开度进行描述,漏失量与裂缝开度之间基本满足立方定律,但随着串联缝漏失速度的增大和弯曲缝弯曲度的增加误差增大,因此在一定范围内可根据立方定律对漏失压力进行预测.为泥浆帽钻井漏失压力的预测和参数设计提供了理论依据.
泥漿帽控壓鑽井是針對嚴重漏失地層的一種前沿鑽井工藝,漏失壓力的確定是泥漿帽鑽井參數設計的關鍵.由于裂縫邊界條件的複雜性,漏失壓力預測目前還沒有可靠的方法.通過對不同形式組閤縫以及彎麯縫的數值模擬,分析漏失壓差和裂縫參數對漏失量的影響規律.研究錶明:不同形式裂縫可通過等效裂縫開度進行描述,漏失量與裂縫開度之間基本滿足立方定律,但隨著串聯縫漏失速度的增大和彎麯縫彎麯度的增加誤差增大,因此在一定範圍內可根據立方定律對漏失壓力進行預測.為泥漿帽鑽井漏失壓力的預測和參數設計提供瞭理論依據.
니장모공압찬정시침대엄중루실지층적일충전연찬정공예,루실압력적학정시니장모찬정삼수설계적관건.유우렬봉변계조건적복잡성,루실압력예측목전환몰유가고적방법.통과대불동형식조합봉이급만곡봉적수치모의,분석루실압차화렬봉삼수대루실량적영향규률.연구표명:불동형식렬봉가통과등효렬봉개도진행묘술,루실량여렬봉개도지간기본만족립방정률,단수착천련봉루실속도적증대화만곡봉만곡도적증가오차증대,인차재일정범위내가근거립방정률대루실압력진행예측.위니장모찬정루실압력적예측화삼수설계제공료이론의거.
Mud cap managed pressure drilling is an advanced technique that used on severe lost circulation formations, the key parameter in mud cap drilling design is the determination of lost circulation pressure. Because of the complexity of the fracture boundary condition, there is still no reliable method to predict lost circulation pressure so far. The influence rules of lost circulation pressure difference and fracture parameters to loss rate is analyzed through the numerical simulation of different types of multiple fractures and curved fractures. The research shows that different types of fractures can be described by equivalent fracture aperture, the relationship between loss rate and fracture aperture would follow Cubic Law, but the inaccuracy increases as the loss rate of the series fractures increasing and the curvature degree of curved fractures increasing. So the lost circulation pressure can be predicted by Cubic Law and this provides theoretical criterion for the prediction of lost circulation pressure and other parameters in mud cap drilling.